Merge branch 'start-gallery-thing' into 'v3'

Start implementing GalleryThing

See merge request openflexure/openflexure-microscope-server!576

src/openflexure_microscope_server/things/__init__.py

@@ -15,6 +15,13 @@ class OFMThing(lt.Thing):
 
     _data_dir: Optional[str] = None
 
+    _show_data_in_gallery: bool = False
+
+    @property
+    def show_data_in_gallery(self) -> bool:
+        """Whether to show in the Gallery."""
+        return self._show_data_in_gallery
+
     def __enter__(self) -> Self:
         """Set the data directory when the Thing is entered."""
         # Note that the `application_config` was already validated when the

src/openflexure_microscope_server/things/camera/__init__.py

@@ -25,6 +25,7 @@ from pydantic import BaseModel, Field
 import labthings_fastapi as lt
 from labthings_fastapi.types.numpy import NDArray
 
+from openflexure_microscope_server.things import OFMThing
 from openflexure_microscope_server.things.background_detect import (
     BackgroundDetectAlgorithm,
 )
@@ -164,7 +165,7 @@ class CameraMemoryBuffer:
             del self._storage[key]
 
 
-class BaseCamera(lt.Thing):
+class BaseCamera(OFMThing):
     """The base class for all cameras. All cameras must directly inherit from this class.
 
     The connection to the camera hardware should be added to the ``__enter__`` method not

src/openflexure_microscope_server/things/gallery.py

@@ -0,0 +1,99 @@
+"""Server-side gallery functionality.
+
+The types of data that are captured and how they display in the gallery are defined by
+the Things that capture the Data. This thing just provides a unified way for the gallery
+front end to access the data.
+"""
+
+from typing import Any, Mapping, Optional, Protocol, Self, cast, runtime_checkable
+
+from pydantic import BaseModel
+
+import labthings_fastapi as lt
+
+from openflexure_microscope_server.things import OFMThing
+
+
+@runtime_checkable
+class GalleryCompatibleThing(Protocol):
+    """Protocol for checking Things using the gallery are complete.
+
+    Note that runtime checkable protocols only check that the methods exist, not the
+    full signatures. This means that anything attempting to define the methods will
+    be picked up, but may throw an error when used.
+    """
+
+    # Ensure it is a Thing:
+    _thing_server_interface: lt.ThingServerInterface
+
+    # Ensure it is an OFMThing:
+    show_data_in_gallery: bool
+
+    gallery_data_name: str
+
+    gallery_data_schema: type[BaseModel]
+
+    # Ignore D102: No docstrings for the protocol.
+    def get_data_for_gallery(self) -> list[BaseModel]: ...  # noqa: D102
+
+
+class GalleryThing(lt.Thing):
+    """A Thing for communicating with the front end gallery."""
+
+    all_ofm_things: Mapping[str, OFMThing] = lt.thing_slot()
+
+    _gallery_providing_things: Optional[Mapping[str, GalleryCompatibleThing]] = None
+
+    @property
+    def gallery_providing_things(self) -> Mapping[str, GalleryCompatibleThing]:
+        """All Things that provide data to the gallery."""
+        if self._gallery_providing_things is None:
+            raise RuntimeError(
+                "Cannot access gallery_providing_things before server has started."
+            )
+        return self._gallery_providing_things
+
+    def __enter__(self) -> Self:
+        """Check for all gallery providing things on server startup."""
+        self._set_gallery_providers()
+        return self
+
+    def _set_gallery_providers(self) -> None:
+        """Set the mapping of gallery providing things.
+
+        This is called on ``__enter__`` when the server starts.
+        """
+        gallery_providers = {
+            name: thing
+            for name, thing in self.all_ofm_things.items()
+            if thing.show_data_in_gallery
+        }
+        # cache initial list of keys as it may change in the loop
+        keys = list(gallery_providers.keys())
+        for key in keys:
+            if not isinstance(gallery_providers[key], GalleryCompatibleThing):
+                self.logger.error(
+                    f"Data from {key} cannot be shown in gallery as it does not "
+                    "provide all necessary properties/methods for the gallery."
+                )
+                gallery_providers.pop(key)
+
+        # Cast the type of each thing to "GalleryCompatibleThing" as other Things have
+        # been popped.
+        self._gallery_providing_things = cast(
+            Mapping[str, GalleryCompatibleThing], gallery_providers
+        )
+
+    @lt.property
+    def list_data(self) -> list[dict[str, Any]]:
+        """List the data from all registered things.
+
+        Currently only works with `smart_scan` as the UI cards are not customisable.
+
+        This will change to an action (or another type of endpoint) at a
+        later date to enable filtering, and returning only a specific page.
+        """
+        data_list = []
+        for thing in self.gallery_providing_things.values():
+            data_list += [model.model_dump() for model in thing.get_data_for_gallery()]
+        return data_list

src/openflexure_microscope_server/things/smart_scan.py

@@ -71,16 +71,6 @@ class ActiveScanData(scan_directories.BaseScanData):
         self.scan_result = result
 
 
-class ScanListInfo(BaseModel):
-    """The information to be sent to the Scan List tab."""
-
-    scans: list[scan_directories.ScanInfo]
-    """The list of scans as ScanInfo objects"""
-
-    ongoing: Optional[str]
-    """The name of the ongoing scan or None"""
-
-
 class JPEGBlob(lt.blob.Blob):
     """A class representing a JPEG image as a LabThings FastAPI Blob."""
 
@@ -176,6 +166,31 @@ class SmartScanThing(OFMThing):
         In this case it doesn't need to do anything.
         """
 
+    # Register with gallery.
+    _show_data_in_gallery = True
+
+    @property
+    def gallery_data_name(self) -> str:
+        """Name under which data shows up in gallery."""
+        return "Scans"
+
+    @property
+    def gallery_data_schema(self) -> type[scan_directories.ScanInfo]:
+        """The schema (BaseModel) for passing data to the gallery."""
+        return scan_directories.ScanInfo
+
+    def get_data_for_gallery(self) -> list[scan_directories.ScanInfo]:
+        """Return all the information from the scan directories.
+
+        It is preferable to use the method rather than calling
+        _scan_dir_manager.all_scans_info() directly as it will handle stopping the json
+        in any ongoing scans being read.
+        """
+        ongoing_name = None if self._ongoing_scan is None else self.ongoing_scan.name
+        return self._scan_dir_manager.all_scans_info(
+            ongoing=ongoing_name, include_ongoing=False
+        )
+
     # Note that the default detector name is set at init. This is over written if
     # setting is loaded from disk.
     @lt.setting
@@ -544,31 +559,6 @@ class SmartScanThing(OFMThing):
     stitch_automatically: bool = lt.setting(default=True)
     """Whether to run a final stitch at the end of a successful scan."""
 
-    def _get_all_scan_info(self) -> list[scan_directories.ScanInfo]:
-        """Return all the information from the scan directories.
-
-        It is preferable to use the method rather than calling
-        _scan_dir_manager.all_scans_info() directly as it will handle stopping the json
-        in any ongoing scans being read.
-        """
-        ongoing_name = None if self._ongoing_scan is None else self.ongoing_scan.name
-        return self._scan_dir_manager.all_scans_info(ongoing=ongoing_name)
-
-    @lt.property
-    def scans(self) -> ScanListInfo:
-        """All the available scans.
-
-        Each scan has a name (which can be used to access it), along with
-        its modified and created times (according to the filesystem) and
-        the number of items in the ``images`` folder. Note that image count
-        uses a regular expression, and changes to the naming scheme will
-        break it.
-        """
-        return ScanListInfo(
-            scans=self._get_all_scan_info(),
-            ongoing=None if self._ongoing_scan is None else self.ongoing_scan.name,
-        )
-
     @lt.endpoint(
         "get",
         "get_stitch/{scan_name}",
@@ -632,8 +622,8 @@ class SmartScanThing(OFMThing):
     @lt.action
     def purge_empty_scans(self) -> None:
         """Delete all scan folders containing no images at the top level."""
-        # JSON is ignored as it's created before any images are captured
-        for scan_info in self._get_all_scan_info():
+        # Use the scan list (the data read by the gallery) to check for empty scans.
+        for scan_info in self.get_data_for_gallery():
             if scan_info.number_of_images == 0:
                 self._delete_scan(scan_info.name)
 
@@ -748,6 +738,8 @@ class SmartScanThing(OFMThing):
         """
         if self._scan_lock.locked():
             raise RuntimeError("Can't stitch previous scans while a scan is ongoing")
-        for scan in self._get_all_scan_info():
+        # Use the scan list (the data read by the gallery) to find any scans that
+        # need stitching.
+        for scan in self.get_data_for_gallery():
             if scan.dzi is None:
                 self.stitch_scan(scan_name=scan.name)